JP7087661B2 - Elastic crawlers and core materials for elastic crawlers - Google Patents

Description

The present invention relates to an endless strip-shaped elastic crawler and a core material for an elastic crawler.

Conventionally, an elastic crawler including a crawler main body made of an elastic body, a core material embedded in the crawler main body, and a tension body embedded in the outer peripheral surface side of the crawler with respect to the core material of the crawler main body is known. For example, the following Patent Document 1 describes an elastic crawler as described above, the first core metal which is a core material having a wing portion for receiving the tensile strength of the tension body, and a wing which does not substantially receive the tensile strength. It has a second core metal which is a core material having a portion. Patent Document 1 describes an elastic crawler by alternately arranging a first core metal that receives tensile strength and a second core metal that is smaller and lighter than the first core metal in the circumferential direction of the crawler. We are proposing to reduce the weight.

Japanese Unexamined Patent Publication No. 2011-207365

However, in the elastic crawler of Patent Document 1, the area where the second core metal contacts the crawler body is small, and the adhesive force between the second core metal and the crawler body may decrease, which further improves the durability of the elastic crawler. There was room for improvement.

The present invention has been devised in view of the above circumstances, and an object of the present invention is to provide an elastic crawler capable of achieving both weight reduction and durability.

The present invention is an elastic crawler, which is made of an elastic body, has an endless band-shaped crawler body having a first edge and a second edge in the crawler width direction, and is embedded in the crawler body at intervals in the crawler circumferential direction. A core material and a tension body embedded on the outer peripheral side of the crawler with respect to the core material of the crawler body and for applying tensile strength to the crawler body are included, and the tension body is the first of the crawler body. A first tension body embedded in one edge side and a second tension body embedded in the second edge side of the crawler body are included, and the core material includes a first core material.
The first core material is arranged so as to face the first tension body and is arranged close to the first tension body so as to receive the tension from the first tension body. And a second wing portion arranged to face the second tension body and separated from the second tension body so as not to substantially receive the tension from the second tension body. It is characterized by including.

In the elastic crawler of the present invention, it is desirable that the second wing portion has a smaller length in the crawler width direction than the first wing portion.

In the elastic crawler of the present invention, it is desirable that the second wing portion has a smaller thickness in the crawler thickness direction than the first wing portion.

In the elastic crawler of the present invention, when wound around the drive wheel, the distance L6 between the center of the drive wheel and the second tension body located on the outer peripheral side of the crawler of the second wing portion is the distance L6 of the drive wheel. It is desirable that the distance between the center and the first tension body located on the outer peripheral side of the crawler of the first wing portion is smaller than L5.

In the elastic crawler of the present invention, the difference (L5-L6) between the distance L5 of the first tension body and the distance L6 of the second tension body when wound around the drive wheel is the tension body. It is desirable that the distance between the outer surface of the second wing portion and the second tension body when the tensile strength is not acting is smaller than L4.

In the elastic crawler of the present invention, it is desirable that the first core material includes a pair of protrusions protruding toward the inner peripheral side of the crawler, and the protrusions have a rolling wheel passing surface.

In the elastic crawler of the present invention, it is desirable that the first wing portion and the second wing portion each have a rolling wheel passing surface on the inner peripheral side of the crawler.

In the elastic crawler of the present invention, the core material includes a second core material, and the second core material is arranged to face the first tension body and substantially said from the first tension body. The third wing portion arranged apart from the first tension body so as not to receive the tensile strength, and the third wing portion arranged opposite to the second tension body and to receive the tensile strength from the second tension body. It is desirable to include a fourth wing portion arranged in close proximity to the second tension body.

In the elastic crawler of the present invention, it is desirable that the first core material and the second core material have the same core material arranged in the direction opposite to the center line in the crawler width direction. ..

In the elastic crawler of the present invention, it is desirable that the first core material and the second core material are alternately arranged in the circumferential direction of the crawler.

In the elastic crawler of the present invention, it is desirable that the first core material and the second core material each include a protrusion extending in the circumferential direction of the crawler and preventing misalignment in the width direction of the crawler.

The present invention is preferably a core material used in the elastic crawler described above.

In the elastic crawler of the present invention, the tension body includes a first tension body embedded in the first edge side of the crawler body and a second tension body embedded in the second edge side of the crawler body. The core material includes a first core material, and the first core material is arranged so as to face the first tension body and receives tensile strength from the first tension body. From the second tension body so as to be arranged facing the second tension body and substantially not to receive the tension from the second tension body with the first wing portion arranged close to the second tension body. Includes a second wing that is spaced apart.

Since the second wing portion of such an elastic crawler does not receive tensile force, the elastic body located on the inner peripheral side of the crawler of the second tension body contracts even when a large external force acts on the elastic crawler. The force acting on the core material can be dispersed, and the durability of the elastic crawler can be improved. Further, since the first core material can form the second wing portion smaller than the first wing portion, the weight of the elastic crawler can be reduced. On the other hand, since the first core material has a large area in contact with the crawler main body of the first wing portion, the adhesive force can be improved and the durability of the elastic crawler can be further improved. Therefore, the elastic crawler of the present invention can achieve both weight reduction and durability.

It is a perspective view which shows the 1st Embodiment of the elastic crawler of this invention. It is sectional drawing of an elastic crawler. It is a perspective view of a core material and a tension body. It is a side view of the elastic crawler wound around a drive wheel. It is a perspective view of the elastic crawler of the 2nd Embodiment. It is a top view of the elastic crawler of the 2nd Embodiment. It is a top view of the elastic crawler of the third embodiment.

Hereinafter, the first embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a perspective view showing an elastic crawler 1 of the present embodiment. As shown in FIG. 1, the elastic crawler 1 of the present embodiment includes a crawler main body 2, a core material 3 embedded in the crawler main body 2, and a tension body 4 for applying tensile strength F to the crawler main body 2. Includes. Such an elastic crawler 1 is suitably used, for example, as a traveling body of a construction machine or the like.

The crawler body 2 is made of an elastic body such as rubber. It is desirable that the crawler body 2 extends in the circumferential direction of the crawler and has an endless band shape having a substantially constant width defined by the first edge 2a and the second edge 2b.

Here, in the present specification, the crawler circumferential direction is the rotation direction of the elastic crawler 1, and corresponds to the direction indicated by the reference numeral a in FIG. Further, the crawler width direction is the axial direction of the drive wheel D (shown in FIG. 4) when the elastic crawler 1 is mounted on the vehicle, and corresponds to the direction indicated by the reference numeral b in FIG. Further, the crawler thickness direction is a direction orthogonal to the crawler circumferential direction a and the crawler width direction b, and corresponds to the direction indicated by the reference numeral c in FIG. In the crawler thickness direction c, the inside of the endless band-shaped elastic crawler 1 is the crawler inner peripheral side ci, and the outside of the endless band-shaped elastic crawler 1 is the crawler outer peripheral side co.

The crawler main body 2 of the present embodiment has an outer peripheral surface 2o of the crawler outer peripheral side co and an inner peripheral surface 2i of the crawler inner peripheral side ci. For example, a plurality of lugs 5 are formed on the outer peripheral surface 2o of the crawler main body 2. The lug 5 of the present embodiment includes a first lug 5A formed on the first edge 2a side and a second lug 5B formed on the second edge 2b side.

The core material 3 of the present embodiment is embedded in the crawler main body 2 at intervals in the crawler circumferential direction a. It is desirable that the core material 3 is made of a material that is harder than the elastic body constituting the crawler main body 2. The core material 3 is formed of, for example, a metal material such as steel or cast iron. The core material 3 may be made of a hard resin. It is desirable that the core material 3 includes a wing portion 6 arranged to face the tension body 4. Such a core material 3 is suitably used for the elastic crawler 1 and can reinforce the crawler main body 2 and maintain the shape of the crawler main body 2.

It is desirable that the tension body 4 is embedded in the outer peripheral side co of the crawler rather than the core material 3 of the crawler main body 2. The tension body 4 includes, for example, a metal cord layer 9 extending in the circumferential direction a of the crawler. In the metal cord layer 9 of the present embodiment, a plurality of metal cords 9a extending in the crawler circumferential direction a are arranged in the crawler width direction b.

The tension body 4 of the present embodiment has a first tension body 4A embedded in the first edge 2a side of the crawler body 2 and a second tension body 4B embedded in the second edge 2b side of the crawler body 2. And include. It is desirable that the first tension body 4A and the second tension body 4B each include a metal cord layer 9. Such a tension body 4 can uniformly apply the tensile strength F in the crawler width direction b of the crawler main body 2.

FIG. 2 is a cross-sectional view of the elastic crawler 1. As shown in FIG. 2, the core material 3 of the present embodiment includes the first core material 3A. The first core material 3A includes a first wing portion 6A arranged to face the first tension body 4A and a second wing portion 6B arranged to face the second tension body 4B. desirable. That is, the wing portion 6 of the first core material 3A includes the first wing portion 6A and the second wing portion 6B. The first wing portion 6A is arranged close to the first tension body 4A so as to receive the tensile strength F from the first tension body 4A, for example. The second wing portion 6B is arranged apart from the second tension body 4B, for example, so as not to receive the tensile strength F substantially from the second tension body 4B.

In such an elastic crawler 1, since the second wing portion 6B does not receive the tensile stress F, the elasticity located on the crawler inner peripheral side ci of the second tension body 4B even when a large external force acts on the elastic crawler 1. By contracting the body, the force acting on the core material 3 can be dispersed. Therefore, the core material 3 does not have a possibility of a large external force acting on the core material 3, and the durability of the elastic crawler 1 can be improved. Further, since the first core material 3A can form the second wing portion 6B smaller than the first wing portion 6A, the elastic crawler 1 can be made lighter. On the other hand, since the first core material 3A has a large area in contact with the crawler main body 2 of the first wing portion 6A, the adhesive strength can be improved and the durability of the elastic crawler 1 can be improved. Therefore, the elastic crawler 1 of the present embodiment can achieve both weight reduction and durability at the same time.

As a more preferable embodiment, the first core material 3A includes a drive portion 7 connecting the first wing portion 6A and the second wing portion 6B, and a pair of protrusions 8 protruding from the drive portion 7 to the crawler inner peripheral side ci. Includes. The drive unit 7 is located, for example, on the center line CL in the crawler width direction b, and transmits the drive force from the drive wheel D (shown in FIG. 4) to the elastic crawler 1. Here, the center line CL is the central position in the crawler width direction b between the first edge 2a and the second edge 2b of the crawler main body 2. The pair of protrusions 8 regulate the positions of the drive wheels D, idle wheels, rolling wheels, etc. (not shown) in the crawler width direction b, and prevent the elastic crawler 1 from being derailed.

It is desirable that the protrusion 8 has a rolling wheel passing surface 10 on the crawler inner peripheral side ci. By stably supporting the rolling wheels (not shown), the first core material 3A can suppress vibration and noise during traveling, and can improve the riding comfort performance of the elastic crawler 1. can. Further, since the elastic crawler 1 of the present embodiment can support the rolling wheel by the protrusion 8, it can be mounted as a substitute for a general metal crawler.

It is desirable that the second wing portion 6B has a smaller length in the crawler width direction b than the first wing portion 6A. That is, it is desirable that the length L2 of the second wing portion 6B is smaller than the length L1 of the first wing portion 6A. Here, the length L1 of the first wing portion 6A is the length from the base of the protrusion 8 on the first wing portion 6A side to the outer end portion of the first wing portion 6A in the crawler width direction b. Further, the length L2 of the second wing portion 6B is the length from the base of the protrusion 8 on the second wing portion 6B side to the outer end portion of the second wing portion 6B in the crawler width direction b.

It is desirable that the thickness of the second wing portion 6B is smaller in the crawler thickness direction c than that of the first wing portion 6A. That is, it is desirable that the thickness t2 of the second wing portion 6B is smaller than the thickness t1 of the first wing portion 6A. Here, the thickness t1 of the first wing portion 6A is the crawler thickness direction c from the outer surface 6a of the crawler outer peripheral side co of the first wing portion 6A to the inner surface 6b of the crawler inner peripheral side ci of the first wing portion 6A. Is the length of. Further, the thickness t2 of the second wing portion 6B is the crawler thickness direction c from the outer surface 6c of the crawler outer peripheral side co of the second wing portion 6B to the inner surface 6d of the crawler inner peripheral side ci of the second wing portion 6B. The length.

In such a first core material 3A, since the second wing portion 6B is smaller than the first wing portion 6A, the elastic crawler 1 can be reduced in weight. Further, since the first wing portion 6A has a large area in contact with the crawler main body 2, the adhesive force can be improved and the durability of the elastic crawler 1 can be improved.

The distance L4 between the outer surface 6c of the second wing portion 6B and the second tension body 4B when the tensile strength F is not acting on the tension body 4 is the outer surface 6a of the first wing portion 6A and the first tension body 4A. It is desirable that the distance from is larger than L3. Here, the distance L3 is the distance between the outer surface 6a of the first wing portion 6A and the center position of the metal cord layer 9 of the first tension body 4A. Further, the distance L4 is the distance between the outer surface 6c of the second wing portion 6B and the center position of the metal cord layer 9 of the second tension body 4B. When the elastic crawler 1 is wound around the drive wheel D (shown in FIG. 4), the second wing portion 6B does not receive the tensile strength F of the second tension body 4B, and the durability is improved. Can be made to.

FIG. 3 is a perspective view of the core material 3 and the tension body 4 in which the crawler body 2 of the elastic crawler 1 is omitted. As shown in FIG. 3, the core material 3 of the present embodiment includes the second core material 3B. The second core material 3B includes a third wing portion 6C arranged to face the first tension body 4A and a fourth wing portion 6D arranged to face the second tension body 4B. desirable. That is, the wing portion 6 of the second core material 3B includes the third wing portion 6C and the fourth wing portion 6D. The third wing portion 6C is arranged apart from the first tension body 4A, for example, so as not to receive the tensile strength F substantially from the first tension body 4A. The fourth wing portion 6D is arranged close to the second tension body 4B so as to receive the tensile strength F from the second tension body 4B, for example.

In such an elastic crawler 1, since the third blade portion 6C does not receive the tensile strength F, even when a large external force acts on the elastic crawler 1, the force acting on the core material 3 can be dispersed, and the elastic crawler can be distributed. The durability of 1 can be improved. Further, since the second core material 3B can form the third wing portion 6C smaller than the fourth wing portion 6D, the elastic crawler 1 can be made lighter. On the other hand, since the second core material 3B has a large area in contact with the crawler main body 2 of the fourth wing portion 6D, the adhesive strength can be improved and the durability of the elastic crawler 1 can be improved. Therefore, the elastic crawler 1 of the present embodiment can achieve both weight reduction and durability at the same time.

It is desirable that the first core material 3A and the second core material 3B have the same core material 3 arranged in the opposite direction to the center line CL. Therefore, the length of the third wing portion 6C is smaller in the crawler width direction b than that of the fourth wing portion 6D. Further, the thickness of the third wing portion 6C is smaller in the crawler thickness direction c than that of the fourth wing portion 6D. Similar to the first core material 3A, the second core material 3B has a drive unit 7 connecting the third wing portion 6C and the fourth wing portion 6D, and a pair of protrusions protruding from the drive portion 7 to the crawler inner peripheral side ci. Includes part 8 and. Such a first core material 3A and a second core material 3B can reduce the management cost as a part, and can suppress the manufacturing cost of the elastic crawler 1.

In the present embodiment, the first core material 3A and the second core material 3B are alternately arranged in the crawler circumferential direction a. In such an elastic crawler 1, the first wing portion 6A that receives the tensile strength F of the first tension body 4A and the third wing portion 6C that substantially does not receive the tensile strength F of the first tension body 4A are crawler circumferences. Since they are arranged alternately in the direction a, the force acting on the crawler circumferential direction a can be uniformly dispersed. Further, in this elastic crawler 1, the fourth wing portion 6D that receives the tensile strength F of the second tension body 4B and the second wing portion 6B that does not substantially receive the tensile strength F of the second tension body 4B are crawler circumferences. Since they are arranged alternately in the direction a, the force acting on the crawler circumferential direction a can be uniformly dispersed.

FIG. 4 is a schematic side view of the elastic crawler 1 wound around the drive wheel D. In FIG. 4, the description of the crawler main body 2 is omitted. As shown in FIG. 4, when the elastic crawler 1 is wound around the drive wheel D, the second tension body 4B located on the crawler outer peripheral side co of the second wing portion 6B is the crawler of the first wing portion 6A. It is located on the crawler inner peripheral side ci rather than the first elastic body 4A located on the outer peripheral side co. That is, when wound around the drive wheel D, the distance L6 between the center of the drive wheel D and the second tension body 4B located on the outer peripheral side co of the crawler of the second wing portion 6B is the center of the drive wheel D and the second. It is smaller than the distance L5 from the first tension body 4A located on the outer peripheral side co of the crawler of the wing portion 6A.

The difference (L5-L6) between the distance L5 of the first tension body 4A and the distance L6 of the second tension body 4B when wound around the drive wheel D is the difference (L5-L6) when not wound around the drive wheel D. It is desirable that the distance between the outer surface 6c of the second wing portion 6B and the second tension body 4B is smaller than the distance L4 (shown in FIG. 2). This difference (L5-L6) corresponds to the amount of contraction of the elastic body located on the crawler inner peripheral side ci of the second tension body 4B. Since the second blade portion 6B does not receive the tensile strength F even when the elastic crawler 1 is wound around the drive wheel D, the force acting on the core material 3 can be dispersed, and the elastic crawler 1 can disperse the force acting on the core material 3. Durability can be improved.

FIG. 5 is a perspective view of the elastic crawler 21 of the second embodiment, and FIG. 6 is a plan view thereof. The same elements as those in the above-described embodiment are designated by the same reference numerals, and the description thereof will be omitted. As shown in FIGS. 5 and 6, the elastic crawler 21 of this embodiment has a crawler body 2, a core material 22 embedded in the crawler body 2, and a tension for applying tensile strength F to the crawler body 2. Includes body 4. In FIG. 5, the description of the crawler body 2 is omitted, and in FIG. 6, the crawler body 2 and the tension body 4 are described by a two-dot chain line.

Similar to the above-described embodiment, the tension body 4 has a first tension body 4A embedded in the first edge 2a side of the crawler body 2 and a second tension body embedded in the second edge 2b side of the crawler body 2. Includes tension body 4B.

The core material 22 of this embodiment includes a first core material 22A and a second core material 22B. The first core material 22A includes a first wing portion 23A arranged to face the first tension body 4A and a second wing portion 23B arranged to face the second tension body 4B. desirable. The first core material 22A preferably includes a drive portion 7 that connects the first wing portion 23A and the second wing portion 23B, and a pair of protrusions 8 that project from the drive portion 7 to the crawler inner peripheral side ci. ..

It is desirable that the first wing portion 23A and the second wing portion 23B each have a rolling wheel passing surface 24 on the crawler inner peripheral side ci. Therefore, the first core material 22A of this embodiment can support the rolling wheels on the rolling wheel passing surface 24 on the first wing portion 23A and the second wing portion 23B.

The second core material 22B includes a third wing portion 23C arranged to face the first tension body 4A and a fourth wing portion 23D arranged to face the second tension body 4B. desirable. The second core material 22B preferably includes a drive portion 7 that connects the third wing portion 23C and the fourth wing portion 23D, and a pair of protrusions 8 that project from the drive portion 7 to the crawler inner peripheral side ci. ..

It is desirable that the third wing portion 23C and the fourth wing portion 23D each have a rolling wheel passage surface 24 on the crawler inner peripheral side ci. Therefore, the second core material 22B of this embodiment can support the wheels on the wheel passing surface 24 on the third blade portion 23C and the fourth blade portion 23D.

It is desirable that the first core material 22A and the second core material 22B have the same core material 22 arranged in the opposite direction to the center line CL. The elastic crawler 21 including such a core material 22 can cope with the rolling wheels of the wing portion, and can be mounted on many types of vehicles.

FIG. 7 is a plan view of the elastic crawler 31 of yet another embodiment. The same elements as those in the above-described embodiment are designated by the same reference numerals, and the description thereof will be omitted. As shown in FIG. 7, the elastic crawler 31 of this embodiment includes a crawler main body 2, a core material 32 embedded in the crawler main body 2, and a tension body 4 for applying tensile strength F to the crawler main body 2. Includes. In FIG. 7, the crawler body 2 and the tension body 4 are shown by a two-dot chain line. Similar to the above-described embodiment, the tension body 4 has a first tension body 4A embedded in the first edge 2a side of the crawler body 2 and a second tension body embedded in the second edge 2b side of the crawler body 2. Includes tension body 4B.

The core material 32 of this embodiment includes a first core material 32A and a second core material 32B. The first core material 32A includes a first wing portion 23A arranged to face the first tension body 4A and a second wing portion 23B arranged to face the second tension body 4B. desirable. The first core material 32A preferably includes a drive portion 7 that connects the first wing portion 23A and the second wing portion 23B, and a pair of protrusions 8 that project from the drive portion 7 to the crawler inner peripheral side ci. ..

The second core material 32B includes a third wing portion 23C arranged to face the first tension body 4A and a fourth wing portion 23D arranged to face the second tension body 4B. desirable. The second core material 32B preferably includes a drive portion 7 that connects the third wing portion 23C and the fourth wing portion 23D, and a pair of protrusions 8 that project from the drive portion 7 to the crawler inner peripheral side ci. ..

It is desirable that the first core material 32A and the second core material 32B each include a protrusion 33 extending in the crawler circumferential direction a to prevent positional deviation in the crawler width direction b from each other. In this embodiment, the first core material 32A and the second core material 32B having different positions of the protruding portion 33 in the crawler width direction b are alternately arranged in the crawler circumferential direction a.

The projecting portion 33 is, for example, a first projecting portion 33A projecting from the base of the projecting portion 8 on the first wing portion 23A side of the first core material 32A to one side in the crawler circumferential direction a, and a second projecting portion 33A projecting to the other side. It includes a protrusion 33B. It is desirable that the first protruding portion 33A has a larger length in the crawler circumferential direction a than the second protruding portion 33B.

Further, the protruding portion 33 protrudes to one side with, for example, a third protruding portion 33C protruding from the base of the protruding portion 8 on the second wing portion 23B side of the first core material 32A to the other side in the crawler circumferential direction a. It includes a fourth protrusion 33D. It is desirable that the third protrusion 33C has a larger length in the crawler circumferential direction a than the fourth protrusion 33D.

Similarly, the protruding portion 33 protrudes to one side of the crawler circumferential direction a from the base of the protruding portion 8 on the third wing portion 23C side of the second core material 32B, and to the other side. The sixth protruding portion 33F is included. It is desirable that the fifth protrusion 33E has a larger length in the crawler circumferential direction a than the sixth protrusion 33F.

Further, the projecting portion 33 protrudes to one side with, for example, a seventh projecting portion 33G projecting from the base of the projecting portion 8 on the fourth wing portion 23D side of the second core material 32B to the other side in the crawler circumferential direction a. It includes the eighth protrusion 33H. It is desirable that the seventh protrusion 33G has a larger length in the crawler circumferential direction a than the eighth protrusion 33H.

In this embodiment, the first protrusion 33A, the third protrusion 33C, the fifth protrusion 33E, and the seventh protrusion 33G each have the same length in the crawler circumferential direction a. Further, the second protruding portion 33B, the fourth protruding portion 33D, the sixth protruding portion 33F, and the eighth protruding portion 33H each have the same length in the crawler circumferential direction a.

In the protruding portion 33 of this embodiment, the first protruding portion 33A of the first core material 32A adjacent to the crawler peripheral direction a and the sixth protruding portion 33F of the second core material 32B are in contact with each other, and the first core material 32A is in contact with each other. The fourth protruding portion 33D of the above and the seventh protruding portion 33G of the second core material 32B are in contact with each other. Similarly, in the protruding portion 33, the second protruding portion 33B of the first core material 32A adjacent to the crawler peripheral direction a and the fifth protruding portion 33E of the second core material 32B are in contact with each other, and the first core material 32A The third protruding portion 33C of the above and the eighth protruding portion 33H of the second core material 32B are in contact with each other.

Such a protruding portion 33 can suppress the deviation of the first core material 32A and the second core material 32B in the crawler width direction b, and can prevent the elastic crawler 31 from coming off. Therefore, it is difficult for an excessive external force to act on the elastic crawler 31, and its durability can be improved.

The first core material 32A and the second core material 32B are, for example, those in which the same core material 32 is arranged in the opposite direction to the center line CL by changing the shape of the protrusion 33. May be. In this case, for example, the first protruding portion 33A, the third protruding portion 33C, the fifth protruding portion 33E, and the seventh protruding portion 33G have the second protruding portion 33B, the fourth protruding portion 33D, and the seventh protruding portion 33G, respectively. A shape that sandwiches the 6 protrusions 33F and the 8th protrusions 33H in the crawler width direction b can be adopted. The shape of the protrusion 33 is not limited to the exemplary embodiment, and various shapes can be adopted as long as they suppress the deviation in the crawler width direction b.

Although the particularly preferred embodiment of the present invention has been described in detail above, the present invention is not limited to the above-described embodiment and can be modified into various embodiments.

An elastic crawler having the basic structure shown in FIGS. 1 to 3 was prototyped based on the specifications shown in Table 1. Further, as the elastic crawler to be compared, a conventional example in which core materials having large wings are arranged in the crawler circumferential direction and a comparative example in which core materials having large wings and small core materials are alternately arranged in the crawler circumferential direction. Was prototyped. The weight of these prototype elastic crawlers was measured, and the test crawler was mounted on the test vehicle to test its durability. The test method is as follows.

<Lightening test>
The weight of one test crawler was measured. The result is displayed as an exponent with Comparative Example 1 as 100, and the smaller the value, the better the weight reduction.

<Durability test>
In the test vehicle mounted on the test crawler, the number of times until the core material was damaged when a foreign substance was caught between the drive wheel and the test crawler and driven was measured. The result is displayed as an exponent with Comparative Example 1 as 100, and the larger the value, the better the durability.

The test results are shown in Table 1.

As a result of the test, it was confirmed that the elastic crawler of the example was excellent in weight reduction and durability as compared with the conventional example. Further, it was confirmed that the elastic crawler of the example was excellent in durability while maintaining the same weight reduction as that of the comparative example. Therefore, it was confirmed that the elastic crawler of the example has both weight reduction and durability.

2 Crawler body 2a 1st edge 2b 2nd edge 3 core material 3A 1st core material 3B 2nd core material 4 tension body 4A 1st tension body 4B 2nd tension body 6A 1st wing part 6B 2nd wing part

Claims (12)

It ’s an elastic crawler.
An endless band-shaped crawler body composed of an elastic body and having a first edge and a second edge in the crawler width direction,
A core material embedded in the crawler body at intervals in the crawler circumferential direction,
A tension body embedded in the outer peripheral side of the crawler with respect to the core material of the crawler body and for applying tensile strength to the crawler body is included.
The tension body includes a first tension body embedded in the first edge side of the crawler body and a second tension body embedded in the second edge side of the crawler body.
The core material includes a first core material.
The first core material is arranged so as to face the first tension body and is arranged close to the first tension body so as to receive the tension from the first tension body. And a second wing portion arranged to face the second tension body and separated from the second tension body so as not to substantially receive the tension from the second tension body. Including
The thickness of the second wing portion in the crawler thickness direction is smaller than that of the first wing portion .
Elastic crawler.
The elastic crawler according to claim 1, wherein the second wing portion has a smaller length in the crawler width direction than the first wing portion. The distance L4 in the crawler thickness direction between the outer surface of the second wing portion and the second tension body when the tensile strength is not acting on the tension body is the outer surface of the first wing portion and the first. The elastic crawler according to claim 1 or 2, which is larger than the distance L3 in the crawler thickness direction from the tension body . When wound around the drive wheels, the distance L6 between the center of the drive wheels and the second tension body located on the outer peripheral side of the crawler of the second wing portion is the center of the drive wheels and the first wing portion. The elastic crawler according to any one of claims 1 to 3, which is smaller than the distance L5 from the first tension body located on the outer peripheral side of the crawler. The difference (L5-L6) between the distance L5 of the first tension body and the distance L6 of the second tension body when wound around the drive wheel is that the tension is acting on the tension body. The elastic crawler according to claim 4, wherein the distance between the outer surface of the second wing portion and the second tension body when the second wing portion is absent is smaller than L4. The first core material includes a pair of protrusions protruding toward the inner peripheral side of the crawler.
The elastic crawler according to any one of claims 1 to 5, wherein the protrusion has a rolling wheel passing surface. The elastic crawler according to any one of claims 1 to 5, wherein the first wing portion and the second wing portion each have a rolling wheel passing surface on the inner peripheral side of the crawler. The core material includes a second core material.
The second core material was arranged so as to face the first tension body and separated from the first tension body so as not to receive the tensile strength substantially from the first tension body. A third wing portion and a fourth wing portion arranged to face the second tension body and close to the second tension body so as to receive the tensile strength from the second tension body. The elastic crawler according to any one of claims 1 to 5. The elastic crawler according to claim 8, wherein the first core material and the second core material are the same core material arranged in the direction opposite to the center line in the crawler width direction. The elastic crawler according to claim 8 or 9, wherein the first core material and the second core material are alternately arranged in the circumferential direction of the crawler. The elastic crawler according to claim 10, wherein the first core material and the second core material each include a protrusion that extends in the circumferential direction of the crawler and prevents misalignment in the width direction of the crawler. A core material used for the elastic crawler according to any one of claims 1 to 11.

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